Brake mechanism.



I W z'inesses C. C. BLANCH.

BRAKE MECHANISM.

APPLICATION FILED AUG.I3, 1914.

I Patented Feb. 1, 1916.

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T COLUMBIA PLANOGRAPH 60., WASHINGTON D c C. C. BLANCH.

BRAKE MECHANISM.

APPLICATION FILED AuGJa, 1914. I

1, 170,216. Patented Feb. 1, 1916.

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BRAKE ,MEGHANISM.

Specification of Letters Patent. 1

v Patented Feb. 1, 19161.

Application filed August 13, 1'91'4'. Serial No. 856,682.

tion, combined with strength, simplicity,

and inexpensiveness.

My Inventionconsists primarily in renthe brake by merely checking the rotation of the driving shaft; andv in such parts and combination of parts as fall within the scope of the appended claims. I

In the accompanying drawings which form a part of this specification; Figure l, is a side view, partly. in section, of my novel brake mechanism, Figs. 2 and 3, sections of the same on lines $"LE and 3 1 respectively'of Fig. 1", Fig l, plan of the same, Figs- 5 and 6, sections respectively on lines a w and 3 y of Fig. 1 showing the parts in open position. Fig. 7, a: longitudinal section of a modified form of my invention, Fig. 8, a side elevation of my brake mechanism incorporatedin an elevating apparatus, and Fig. 9, a section on linele a of Fig. 8.

Like reference characters indicate like parts throughout the views.

cam comprises an oblon-gbody let provided with arcuate end faces 15" terminating in rounded lateral shoulders 16. Integral with the front face of the cam are two projecting lugs 18- diametrically opposite each other adjacent the shafhadapted to serve as clutch elements for one of the two clutch members.

A driven shaft 20 in alinementwith the shaft 10 is the load sustaining shaft. Fixed to this shaft is a sleevex2l having. longitudinal end lugs 23 diametrically opposite each other and located-intermediate the lugs 18. On opposite sides of sleeve-21 are pairs of cars 25 in whicharezmountedon pins 26 intermediate their length arms- 2'( having outwardly extending end: portions 28 terminatin-g in plates 29' towhich are fixed arcuate shoes 31. Upon the opposite ends of the arms 2.? are cross. pieces .or laterally projecting1nembersu33 parallel Wlth.l0ll other at opposite sides of the cam' 13, and so disposed as to bein the path of the portions 16 of the canr when the" cam is rotated. Intermediate the sleeve 21 and the arms27 are springs 35 whose ends bear against the sleeve and the inner edges of the arms respectively.

37 is abearing constituting a part of whatever frame supports my device. In.- tegralw-ith the bearing. is a housing. comprising a: disk 39 and an outwardly directed peripheral flange 40: The shoes 31 are adapted-to be pressed. into contact with the flange 40 by the springs 35.

My mechanism has been described as. em-

bodiedin two: shafts, but operative resultsare attained by the construction shown in Fig. 7, wherein a single shaft 42is substituted for the shafts: l0 and 20. In this case, however, the sleeve 12' is loose on the shaft, and theidriving pulley 43 fixed to or integral with the sleeve 12 issubstituted for the-pulley '11. 5

The operation of my brake mechanism is h'erein shown in connection with a differen tial traction elevator mechanism comprising a 0211'425 traveling pulleyl6-therefor, coun-' ter weight 47, anditstraveling pulley Standards 50 on! I beams 51 are provided with rearward extensions. 52 Journaled the standards in vertical sequence are the shafts 26), 54: and. 55,. and in the extension, Q

is j ournaled a shaft, 56. Uponthe shaft 20 is fixed a sheave 57. Fast on the shaft 54 is a drum. 59, comprising the differential larger and smaller sheaves 60 and 61.

56, the sheaves 64 An endless hoisting rope 66 has in a biglht the pulley 46', whence it passes over the sheave 57, under the sheave 60' over one-sheave 64,- then forms a bight to receive the pulley 4:8, and thence passesover the other sheave "til: under the pulley idler 62 andover thesheave61. Because-of the differential character of the sheaves. 60 and 61,

the car moves upwardly or downwardly.

. the shaft 55 is alshe'ave, and. upon the shaft The operation of the brake mechanism is tively as-shownin Fig. 3. When thepower has hecomeeffective the-driving lugs- 18 ad Vance and occupy the position shown in Fig. 6 in contact with the driven lugs 23, meanwhile the cam 13 has rotated to such an extent that its greater dimensions have brought it in contact with the members 33, whereby the shoes 31 become disengaged from the housing, and the shafts 10 and 20 rotate together thus elevating the car to or permitting it to descend.

If it is desired to apply the brake during the ascent or descent of the ear the operator by any convenient or well known electrical or'other connection operable from the car, stops the rotation of the shaft 10 which brings the cam 13 into position out of contact with the members 33, and then the springs 35 force the shoes 31 into contact with the housing thereby checking the car or load. It will be noted that by this construction the brake operates conformably to the weight of the load. That is to say, the load can not exceed in speed the speed of the power shaft. Under light and heavy loads the brake is equally effective and automatically applies such a degree of impediment to the load as the particular load demands, and this is true regardless of whether the load is being raised or lowered. These features obviously render adjustments unnecessary.

I claim:

1. In a brake mechanism, the combina tion of a shaft, and radially movable pivoted means upon the shaft extending in the direction of the length of said shaft independent of said shaft, shoes carried by said pivoted means, means engageable between the free ends of said radially movable pivoted means, and a member with which said shoes cooperate to check the rotation of the shaft.

2. In a brake mechanism, the combination of a shaft, a fixed housing, means pivotally mounted and extending parallel with the shaft and having lateral means for cooperation with said housing, a cam engageable between the free ends of said pivotally mounted means, cooperating interengaging means between said cam and the shaft, and springs acting on said pivoted means for forcing said lateral means outward.

3. In a brake mechanism, the combination with the frame, of a shaft in the frame, lugs loosely registering with each other and capable of limited axial movement independently of each other, a housing fixed to the frame adjacent the shaft, a cam on the shaft, and yielding means upon the shaft normally in contact with the cam for frictionally engaging the housing when said contact is broken;

4. In a brake mechanism, the combination with the frame, of a shaft in the frame,

a cam on the shaft, lugs on the cam, lugs on the shaft in the path of the first mentioned lugs, a housing on the frame, pivotallymounted yielding arms carried by the shaft in contact with the cam, and shoes on the arms within the housing. I

5. In a brake mechanism, the combination with the frame, of a shaft in the frame, a cam on the. shaft, lugs on the cam, a housing on the frame, a sleeve fast on the shaft, lugs on the sleeve in the path of the first mentioned lugs, ears on the sleeve, arms pivot-ally mounted intermediate their length in the ears provided with end portions in the path of the cam, springs on the sleeve in contact with the arms, and shoes on the arms within the housing.

6. In a brake mechanism, the combination with the frame, of a shaft in the frame, a cam on the shaft provided with curved faces on its opposite ends and with rounded lateral shoulders at the ends of the said faces, lugs on the cam, a housing on the frame, a sleeve on the shaft, lugs on the sleeve in the path of the first mentioned lugs, ears on the sleeve, arms pivotally mounted intermediate their length in the ears having portions adapted tocontact with the cam, springs on the sleeve engaging the arms, and shoes on the arms adapted to engage the housing.

7. In a brake mechanism, the combination with the frame, of a shaft in the frame, a cam on the shaft, lugs on the cam, a housing on the frame, a sleeve fast on the shaft, lugs on the sleeve in the path of the first mentioned lugs, ears on'the sleeve, arms pivotally mounted intermediate their length in the ears, said arms being provided with laterally extending end portions parallel with each other and located in the path of the cam, springs engaging the sleeve and arms, and shoes on the arms adapted to en gage the housing.

8. In a brake mechanism, the combination with the frame, of a rotary shaft in the frame, a sleeve on the shaft, a cam on the sleeve, lugs on the cam, a housing fixed to the frame, a sleeve fast on the shaft, lugs on the second sleeve in the path of the first mentioned lugs, ears on the second sleeve, arms pivotally mounted intermediate their length in the ears in the path of the cam, springs on the second sleeve in contact with the arms, and shoes on the arms in the housing.

9. In a brake mechanism, a shaft, a brake engaging member fixed relatively thereto, a sleeve in which said shaft is rotatable, arms pivotally mounted on said sleeve extending parallel with the shaft and carrying shoes for contact with the brake member, and a rotatable cam on said shaft disposed between and adapted to engage the other ends of said arms.

10. In a brake mechanism, a shaft, a brake engaging member fixed relatively thereto, a

sleeve in which said shaft is rotatable, arms parallel with the shaft and carrying shoes for contact with the brake member, a rota table cam on said shaft disposed between and adapted to engage the other ends of said arms, and means whereby the brake mechanism is thrown into operative position when the rotation of said cam is checked.

11. In a brake mechanism, a shaft, a brake engaging member fixed relatively thereto, a sleeve in which said shaft is rotatable, arms pivotally mounted on said sleeves and carrying shoes for contact with the brake member, a rotatable cam disposed between and adapted to engage the other ends of said arms, and springs interposed between said sleeve and arms for applying the brake when the rotation of the shaft is checked.

1.2. In a brake mechanism, a shaft, a brake member in which the same is mounted, a sleeve on said shaft, a driving pulley loose on said shaft and a brake mechanism interposed between said pulley and the brake member and embodying arms extended parallel with said shaft and a rotatable member engageable between said arms.

13. In a brake mechanism, a shaft, a brake member, in which the same is mounted, a sleeve on said shaft, a driving pulley loose on said shaft and a brake mechanism interposed between said pulley and the brake member and embodying arms extended parallel with said shaft and pivotally mounted on said sleeve and a rotatable member engageable between said arms.

14. In a brake mechanism, a shaft, a brake member in which the same is mounted, a sleeve on said shaft, a driving pulley loose on said shaft, and brake mechanism interposed between said pulley and the brake member and pivotally mounted on said sleeve, said pulley provided with cam surfaces engageable with the pivoted members of the brake mechanism.

In testimony whereof I have affixed my signature in presence of two witnesses.

CHARLES C. BLANCH.

Witnesses:

HORATIO E. BELLOWS, FIELD C. ANDERSON.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. Q, 

